osterberg



(No Model.)

' A. F. S. OS'I'ERBERG.

Key Fastener.

No. 242,030. Patented May 24,1881.

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UNITED STATES PATENT OFFICE.

AUGUST F. S. OSTERBERG, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND OLOF P. ANDERSON, OF SAME PLACE.

KEY-FASTENER.

SPECIFICATION forming part of Letters Patent No. 242,030, dated May 24;, 1881.

Application filed March 10, 1880. (No model.)

To all whom it may concern:

Be it known that I, AUGUST F. S. OSTER- BERG, of Boston, of the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Key -Fasteners; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figures 1 and2 are opposite side views, and Fig. 3 an edgeeevation, ofa fastener of my invention.

Its purpose is to preventa key, when in the key-hole of the lock of a door, from being revolved by pliers or forceps applied to it from the outer side of the door.

It consists of ajawed lever, a stationuryjaw, a clamp-screw, a shield, and a projection, constructed, arrangerhand combined substantially as represented, and hereinafter described.

In the drawings, A denotes the clamp, and B the stud, such clamp consisting of two jaws, a b, an operating-screw, c, and a shield, cl. The said shield is in one piece with the fixed jaw b, through which the thumb-screw c is screwed against the longer arm of the other or movable jaw, a. This latter jaw, arranged against the inner face of the shield, is fulcrumed thereto or turns on a pin, e, extending from it. The stud B projectsfrom thefrontface of the shield in manner as shown.

From the above it will be seen that the shield not only answers as a support for the stud B and the fulcrum of the movable jaw, but as a means of so covering the arm of the latterjaw and the operating-screw of such arm as [0 prevent them from being reached by an im plement inserted through the key-hole for the purpose of breaking the jaw or its screw.

In using the key-fastener it is to be clamped to the shank of the key when such key may be in its lock, the stud B at the time being extended into the key-hole, which will be nearly, it not entirely, covered by the shield. The stud will prevent the key from being revolved.

A key-fastener consisting simply of a clamp to fasten a key-shank, and of a projection to extend from such clamp into a key-hole when the key is in such key-hole, is not new, and therefore is not claimed broadly by me.

What I claim as my invention is as follows:

The key-fastener constructed substantially as described, consisting of the fixed jaw 12, shield d, stud B, thumb-screw c, and the movable jaw or jawed lever a, all arranged and adapted essentially and to operate as set forth.

AUGUST F. S. OSTERBERG. Witnesses:

R. H. EDDY, E. B. PRATT. 

